Before you buy: - What is the difference between Bluetooth Receiver and Transmitter? Bluetooth Receiver (like TT-BR01) connects to your headphones or stereo speakers and makes them Bluetooth enabled. Receivers "listen" to Bluetooth audio broadcast signals and convert it into 3.5 mm audio signal for your headphone and speakers. Bluetooth Transmitter (like TT-BA01 / TT-BA02) can be plugged into your AUDIO GENERATING devices, such as MP3 player, CD player, TV, and computers. Since these devices do not have Bluetooth function, audio signal transmitted through the 3.5 mm connection will be broadcast by the Bluetooth Transmitter. - Cannot be used with a mono/single-side headset. - Cannot be used to make and take phone calls; - When using TaoTronics® TT-BR01, you will have to control play/pause/forwards/backwards on your audio devices. Specification: - Bluetooth Version 2.1 (Class II) - Range: 10 meters - Work Time: 4Hours - Standby Time: 140 Hours - Dimension: 61 x 26 x 8mm - Weight: 17g How to use: 1. Connect the Bluetooth receiver with any stereo headset, headphones or speakers with 3.5mm audio port. 2. Pairing: Press and hold the button for 6 seconds until the red and blue LEDs flash alternatives. The Bluetooth receiver will now be in paring mode. Please place TT-BR01 within 1 meter range of your Bluetooth device during the pairing process. 3. Connection: Pair to the Bluetooth enabled devices automatically. FAQ 1.Q:Can TT-BR01 be used while charging?A:No. TT-BR01 will not be in pairing mode while charging.